Not detected by my computer

Hi !

Yesterday, I received 2 Arduino Nano RP2040 Connect.
I tried to upload a basic sketch. The connection between the first board and my computer didn't work very well but I finally uploaded the basic sketch for the 6axis sensor with the online editor.
Then, I tried some sketches with my arduino Uno and everything worked very well.

After that, I wanted to reupload a new sketch on the nano board.
However, the board was not being detected anymore by my computer.
I tried to change the USB cable or the computer and I also tried to use the IDE on my computer instead of the online editor but nothing worked.
I tried everything with the reset button but, again, nothing worked and the only led turned on is the alimentation led when the board is connected to the computer.
Then, I founded on the internet the factory reset and hard reset but I can't upload any sketches because I found that the board does not appear in the device manager of my computer.

I thought that the board was defective but I tried the other nano board and I had the exact same problem.

Can you help me with my Arduino Nano RP2040 Connect boards ?
Thank you for your help

did you try the double reset to activate the bootloader?

Yes but nothing changed.

https://docs.arduino.cc/tutorials/nano-rp2040-connect/rp2040-01-technical-reference/#board-not-detected

I have already tried that but the mass storage is never opened.

I have just bought a new USB cable and I have done this hard reset. Now, this board works very well. This board seems to be very sensible to old cables.

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